Sevin® insecticides can be applied to new sod or newly seeded areas. If you are applying granules, which must be watered in to release the active ingredient, or you're applying a heavy liquid solution, take care not to wash away seed that has not yet taken root.
Temperatures do not significantly impact the effectiveness or usability of Sevin® brand insecticides. However, temperatures do have a significant effect on insects and their activity. Insects are cold-blooded creatures whose body temperatures are regulated by the temperatures around them. They don't get moving unless it is warm. Temperatures between 70 and 90 degrees Fahrenheit are ideal for treating insects with Sevin® insecticides and maximizing your results.